Tian An Men Square
From the Super Mario Wiki
Tian An Men Square (more commonly spelled Tiananmen Square) is a public area in Beijing that holds numerous notable structures, namely the Monument to the People's Heroes. Alongside the Forbidden City, the Great Wall of China, and the Temple of Heaven, it is one of the landmarks that gets attacked by Koopa Troopas in Mario is Missing! (although it only appears in the DOS and Deluxe versions). The Koopa Troopas run off with the entire Monument to the People's Heroes, and Luigi is asked to return it back to the square. He does just that, bringing it to the square's information booth. Before he can return it, he must answer some questions to prove that the item is genuine, which are as follows:
Tian An Men Square is in the center of Beijing. It became the largest public square in the world when it was expanded from 27 to 98 acres in 1949. The square's name, which means "Gateway of Heavenly Peace," comes from the huge gateway which borders its north side. The Monument to the People's Heroes is a granite obelisk that shows Chinese people who fought and died for their country. At its base is a plaque inscribed with Mao Zedong's words using his personal Chinese characters.